Frederick c



Patented May 15, 1923.

UNITED STATES FREDERICK C. STIMMEL, OF CHATTANQ-Olihll 00., OF GIIATTA'NQOGA, TENNESfiEE, A GQL' ZIOEATION.

WATER-TUBE BOILER.

Application filed April 15, 1920. Serial No. 374,129.

To alt whom it may concern:

Be it known that I. FREDERICK C. STIM- MnL, a citizen of the United States and resident of Chattanooga, in the county of Hamilton and State of Tennessee have in vented a new and Improved ater-Tube Boiler, of which the following is a full, clear, and exact description.

The object of the invention is to provide a new and improved water tube boiler more espically designed for high pressure steam service and capable of taking; care of over load conditions.

Another object is to gradually heat the incoming; feed water and thus reduce ex pansion strains on the water tubes to a minimum.

Another object is to utilize the fuel to the fullest advantage.

Another object is to insure a proper circulation of the water through the water tubes by maintainnrr a unform tube area in the main boiler section and'thus avoid re duced areas which impede circulation of the water.

lVith these and other objects in view, the invention consists of certain novel features of construction as hereinafter shown and described and then specifically pointed out in the claims.

A practical embodiment of the invention is represented in the accompanying drawinns forming a part of this specification. in

. which the figure is an end view of the water tube boiler with the setting: shown in cross section.

The water tube boiler in its general construction consists essentially of a main boiler section and a feed water section, of which the latter is in the rear of the main boiler section and both sections are arranged within a suitable setting 10. The main boiler section comprises a mud drum connected by upwardly and forwardly extending water tubes 16 with an upper front drum 17 connected by rearwardly and slightly upwardly extending; water tubes 18 with the rear upper drum 19 which latter is connected by vertical water tubes 20 with the mud drum 15. i

The feed water section consists essentially of an upper entrance drum connected by vertically disposed water tubes 26 with a lower feed water drum 27 arranged in the rear of the mud drum 15 connected by upright water tubes 28 with the upper rear drum 19 of the main boiler section. A feed water pipe 29 leads from a source of suitable water supply and discharges into the drum 25 of the feed water section. The upper rear drum 19 of the main boiler section. is connected with the upper drum 25 of the feed water section by arched pipes 30 to con duct the steam from the drum 19 into the drum 25 from which the steam may be directly taken to a place of use, but is preferably conducted by a pipe 31 to a small drum 32 forming part of a superheater 33 arranged intermediate the upper portion of the water tubes 16 and the front portion of the water tubes 18. The drum 82 is connected by steam tubes 34 with a drum 35 from which the superheated steam is carried oif to the place of use.

The upper drums 19 and 25 are supported on beams 10 forming part of a structural steel framework built in the setting 10, and the drum 17 is supported on a bracket 1:1 connected with the front upright 42 of the structural steel framework. By the ar rangement described the upper drums 17, 19 and 25 are supported by the framework while the lower drums 15 and 27 are held in suspension and hence are free to expand.

The setting 10 is provided at the front lower porton with a fire box into which the fuel is fed with a suitable stolrer 51, and the lire box 50 provided in the baclr with a fire wall extending in front of the mud drum and reaching to the lowermost of the water tubes 16. From the top of the fire box 50 leads a continuous passage to the chimney connection 53 arranged on the rear wall 54 of the setting and this passage is formed by a number of 60. 61. 62 63. 64, 65, 66 and a wall 67 arranged intermediate the fire wall 52 and the back wall 54; and reaches to the bottom of the lower feed water drum 27. It will be noticed that by the arrangement described, the products of combustion arising from the burning fuel in the fire box 50 strike the water tubes 16 first and then pass upward and around. the upper front drum 17 and rearward between the upper portion of the water tubes 16 to heat the superheated tubes 34. and then the rising products of combustion pass between the water tubes 18. then travel rearwardly over the baffle 63 to pass around the front portion of the rear upper drum 19, then downward between thetubes 20 to the water drum 1.5 and the lower feed water drum 27 to then pass up between the battles 65 and 66 to heat the feed water tubes 28 and to then reach the rear of the drum 19 and the front lower portion of the drum 25 well the connecting steam tubes 30, and to then pass down between the battle 66 and the rear wall 5% to heat the water tubes 26 and the rear portion or the drum 27 and to finally pass through the chimney connection 53 into the chimney.

From the foregoing it will be seen that the feed water passing into the drum 25 and down the tubes 26 into the drum 27 and tromthe latter up through the tubes 28 is gradually subjected to the lowest heat in the setting and hence the water tubes 26 and 28 are not subjected to undue expansion. will be noticed thatthe feed water is subjected to two passes of the products of com bustion while passing down the water tubes 26 and up the water tubes 28, and hence the feed water discharges into the drum 19 practically at boiler temperature and by passing down the water tubes 20 finally reaches the mud drum 15 thus. mingling with the hot water in the main boiler. The water rising from the mud drum 15 through the tubes 16 is subjected to the highest heat in the.

boiler. The water passing through the water tubes'l6 into the front upper drum 17 passes from the latter by way of the water tubes '18 to the rear upper drum 19 in which the water is in more or less violent ebullition, and in order to prevent the steam in this drum 19 from carrying along any Water it is preferably conducted by the arched pipes 30 into the feed water drum 25. Any water carried over by the steam into the :t'eed water contained in the drum while the steam passes from this drum by way oi? the pipe to the superheater 33 to be superheated and thenjcarricd to the place of use in a dry, highly heated state. i

The drums 15 27 are provided with i 'ailve'd blow-elf or draining pipes 70, 71 for periodically carrying oil accumulated sedimcnt. The settinnis also provided with the usual cleaning holes S0 to permit convenient periodical cleaning): or": the boiler soot.

Having thus described my invention, I claim'as new and, desire to secure by Letters Patent 1. In a water tube boiler, a main boiler section and a teed water section, the'main boiler section having a mud'drum, a t'ront upper drum, a rear upper drum in a higher plane than the front drum, a set of up wardly and forwardly inclined tubes connecting the mud drum with the front "upper drum, a set of upwardly and rearwardly inclined tubes connecting; the front and rear upper drums, aset of vertical tubes connecting the rear upper drum with the mud drum, the feed Water section havingan upper receiving drum in rear of and in the same horizontal plane as the rear upper drum of the boiler section, a connection for steam only between the tops of the rear up per drum of the boiler section and the upper receiving drum of the feed water section, a lower feed water drum in rear of the mud drum and disconnected therefrom, a set of vertical tubes connecting the upper receiving drum of the feed water section with the feed water drum of said section, a set of vertical tub-es connecting the upper rear drum of the boiler section with the feed water drum, and a plurality of angularly arranged baffle plates in the space bounded by the tubes connecting the drums of the boiler section, a battle between the tubes ofthe upper drum and the mud and feed water drums, and a battle in the tubes connecting the receiving drum with the feed water drum.

2. In a water tube boiler, a main boiler section and a feed water section, the main boiler section having a mud drum, a front upper drum, a rear upper drum and sets of water tubes connecting the said drums with each other, the said feed water section havi119, an upper drum connected with a feed water supply and arranged in the rear of the said. rear upper drum of the main boiler section and having only a steam connection with said drum, 'a lower drum in the rear of the said mud drum and disconnected from said drum, set of water tubes connecting the said upper and lower feed water drums with each other and a set of water tubes connecting" the said lower feed water drum with the said rear upper drum of the main boiler section, .and a'setting including a fire box, a continuous circuitous passage and a chimney connection in the lower part of its rear wall, the fire box entending under the set of tubes connecting the mud drum with the upper front drum of the main boiler sec- 4 tion, the said. continuous passage conducting the products 0t combustion arising: from the burning fuel in the said "fire box first'to the set oi. tubes connecting the mud drumwith the upper front drum, then to the latter, next to the set of tubes connecting; the front and rear upper drums of the main boiler section with each. other, then to the rear upper main boiler drum. then down to the set of tubes connecting the upper rear drum oi" the maiu'boiler section with the mu d druinthen to the latter and the bottom drum of the feed water section, then up the set of tubes connecting: the said bottom of the feed water section with the rear upper drum of the main boiler section, then to the upper teed waterdrum and then down the set-of tubes connecting the feed water drums with each other'to the chimney connection.

FREDERICK C. STIMMEL, 

